The iOS application lists both Ethernet and WiFi as the network interface. When WiFi network interface is selected for commissioning, the application shows the SSID of the currently connected WiFi network and ask for credentials. If the mobile is connected using Mobile Data, the user will be routed to settings to enable the WiFi.

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There are two options for the gateway to provide internet connectivity, Ethernet or WiFi. And gateway commission is done via BLE from the iOS application.

To provide WiFi credential to the gateway, User needs to select WiFi interface in the iOS mobile application and due to iOS limitation, the user needs to connect iOS mobile to the same WiFi router (with which user want to connect Gateway) from iOS WiFi settings.

In case if a user wants to connect the gateway to the internet via gateway ethernet interface, then the user only needs to select Ethernet in the iOS mobile application and there isn't need to connect iOS mobile to the same router.

I will suggest you upgrade your iPhone 5S. as with big improvement, the iPhone 6 Plus isn't the oldest device that can run iOS 12. That's the iPhone 5S. Just keep in your mind one thing that the iOS 12 is in public beta and performance may change between now and the final release also take care of errors like